Tapered end strand mass



July 10, 1945. J. H. .GARROTT" 1 2,380,

r TA ERED END STRAND MASS Filed Feb. 10, 1942 2 Sheets-Sheet 1 y 1945- I Y J. H. GARROTT I 2,330,033

'fAPERED END STRANDMASS Filed Feb. 10, 1942' 2 Sheets-Sheet 2- mnmm mmmm I INVNTOR. 2 V .f/ M

BY L z Patented July 10, 1945 John H. Garrett, Bloomfield, N. assignor to a The Clark, Thread Company, Newark, N. J., a t

corporation of N ewJersey a Application February 10, 1942, Serial No. 430,223

5 Claims. (o1. 242 -161) This invention relates to the structure of a strand mass wound and carried on a bobbin.

In the are of marketing and using strand masses carried on a mandrel, 510001 or bobbin, it has been found; desirable to control the structure ofthe mass so that it will have a tapered end opposite the base of thebobbin, as this has been found to facilitate'the delivery of the fila ment, as for example thread, cord and the like, therefrom and for this purpose the strand mass is conventionally wound on a spool, bobbin or mandrel having a cylindrical arbor portion and a taperedbas'e. In the conventional thread winding machines the thread is'p'resented to the re tatably mounted bobbin by means of a thread guide which is reciprocated axially in relation to the axis ofthe bobbin through a path of fixed amplitude" and the thread wound on the bobbin byvvhat is termed-across wind. By employing mechanism which advances the bobbin axially arbor I.

Fig. 2 is asimilar partlyz in sections; Fig. 3wis1a-p1anview of thesame looking down on the tapered end;

Fig; 4 is a view of. a different form; Fig.5 'isa view of .a third term.

Referring first to Figs' 1, 2, and 3, themes;

shown 'a spool having a cylindrical or. hollow 3 Whichhas a predetermined radialt'hicknessand a predetermineduleng'th, thislayer iifibeing preferably adjacent to the externalvsurface of the Ordinarily the several radially i successive strand layers are-wound from the same 3 continuouslengthof strand: e. g; thread; cord 1ayer4 iswound upon :the layer :3: Layer 4 may direction toward the. axis of. the spool.

found that there; is a tendency for the filament to uncoil tooireely at the base of the bobbin with theresult that snarls andyotlier difliculties are likely to occur. Moreover, fanother difficulty m arises in the use'of the spools having the straight taper "mentionedj 'In, the'treatment of thread, as-for example the dyeing of coloredthread and the like, lack ofuniformity of shade is likely to occur and in the spools or bobbins having straight taper at the end this lack of uniformity shows upas a mass or series ofsplotches due, apparentlitothe'refiectibn of :light from the smooth and regular surface-of the tapered endq It is ,an object of the present" invention to removethese diihculties and to provide animprovedstrand mass. The principles of the invention will be defined in the appended claims and will be most clearly understood the description of. certain specific illustrative embodiments thereof taken in conjunction with the accompanying drawings, in which? Fig; 1 is an elevation proved strand mass carried on a mandrel or bobbin; r

have the same radial rthicknesszasd andcwiil have substantially the same laxial'i length. ,At 'the end' of the spool opposite: theltaperedrbase 2 thelayer 4 is axially offsetto a predetermined degree in relation to the preceding layer 3 and, as shown, this .oflset'is in a direction parallel to the axis of the bobbin and toward'the basevZ thereof; At

" the end cfthe layer 4 adjacent said base [that portion of layer lwhich is'immediatelyadjacentu said base'isradially offset'to a'predetermi ned dew gree in relationto "the remainder of layer l in a radially successive annularlayen offsetwaxially and radially as described, is tjhen built up in likemanner. v

This structure is most clearly shown in Figure 2. At thefbase .2 of the bobbi n theusurfac'e of each: successive radially offset layer ofthe strand" mass is substantially perpendicular to the axis" l of the bobbin andxforms an acute angle'with the surface of" the tapered baseZ. H Theapparatus or mechanism for producingthe structure illustratedvisnot a part of theipresent;

. invention. It is, however, preferredito employ now U. S.Patent 2,301,693, November 10,1942;

of one form of the im- By. means of this mechanism the bobbinmay be automatically, intermittently and controllably advanced axially of the mandrel upon which .1 it is revolvably mounted while the thread isfe'd to said bobb'in through a thread guide carriedon a transverse bracket reciprocating axially of the bobbin through a path of constant and predetermined magnitude, to produce the stepped or offset wind shown.

The successive axially oifset strata 3 to 8 ,'f or example may have'the same or different radial Each,

thicknesses and the degree to which they are offset axially of the bobbin in relation to each other may also be varied, with the result that instead of a series of steps of uniform dimensions these dimensions may be varied to any predetermined degree. The structure preferred is, however, that shown in Figs. 1 and 2.

The building up of each of the layers l to 8 is continued until the desired radial thicknes is obtained, the axial length of each of said layers being determined by the fixed amplitude of the traverse mechanism of the conventional winding'machine. When the said layer is completed thebobbin is then thrust forward to a predetermined degree by suitable mechanism (as for example that described in my above identified copending application). Since the path of the thread guide is fixed and constant by virtue of the traverse mechanism, the next succeeding layer is axially offset in relation to the preceding layerat theend of the bobbin oppositeithe base to an'extent determined bythe forward .axial thrust of the bobbin. Whenthe thread of the strand mass of eachnext succeeding layer reaches the end of its traverse adjacent the baseof the bobbin'that thread falls into the space'between said end of the preceding layer and the tapered base of the bobbin and, owing to this effect, the end of the said next succeeding layer immediately adjacent the base of the bobbin becomes radially offset in relation to the remainder of the mass of that layer. This will be clear from an inspection thereof. By means of suitable mechanismwhich is not a part of the present invention, preferably that set forth in my said copending application, The configuration of the tapered end may be widely varied, and by reference to said copending application it will be noted that said configuration corresponds to the configuration of the cam which controls the axial advancement of the bobbin. Fig. 4 shows a tapered end the configuration of which is essentially a series of ascending and descending scallops concave toward the axis of the bobbin. Fig. 5 is substantially the negative of Fig. 4, the ascending and descending scallops be ing convex toward the axis of the bobbin.

' I claim: U

. 1. An articleof manufacture comprising a mass of yarn or the like wound on a bobbin, said bobbin having an arbor portion and a tapered base; said masshaving a stepped end formation at the end 7 By the mechanism referred to; the thread is woundspirally on the. mandrel by a cross wind.

In unwinding it follows the same path as thatfollowed in winding, but in the reverse direction. Each core of threadadjacent the base of the 'hobbin'is'located at-"the apex, e. g. the apex 9; of

the angle subtended between the tapered base 2 and the adjacent strand mass surface perpendicular-to the axis of the bobbin. In theconven-- tional strand mass structure, the coil adjacent the base expands due to the natural resilience thereof, but in the described structure this expansion is restrained, the surface of the strand mass perpendicular to the axis of the bobbin forming with the adjacent surfaceof the bobbin, a recess which prevents undue expansion. The coil is, so to speak, releasably locked in this recess, althoughperpendicular to the axis of the bobbin the generally tapered end presents the appearance of a series of ascending and descending right-angle steps, as shown in Figs. 1 and 2. One of theadvantages of this structure is that light rays, falling thereon are reflected in sucha manner that lack of uniformity in dyeing and other treatments does notappear. and the 'salab-ility of the article is therebyimproved. 1

'Referringto Figs. 4 and5 inclusive, these show,

as already stated, modified configurations of the tapered end of the bobbin opposite the. baseface substantially perpendicular to the axis of the arbor, which surface form with the surface. of the taperedbase an annular recess; the second layerextending into and occupying said recess-- and itself forming with the adjacent surface of the tapered base an annular recess; and soon with each successive layera l i 2. An article of manufacture, comprising a mass of yarn or the like wound on a bobbin, said bobbin having an arbor portion and a taperedbase; said ,mass having a stepped end formation at the endof the bobbin and receding toward the base, said lengthwise of the bobbin-from the starting point of the preceding layer a distance commensurate with the lengthwise offset of the ends of the layers remote from their starting points, incident to:

the taper ofthe base.

3. An article of. manufacture comprising a mass of yarn or the like wound on abobbin, said mass composed of a plurality of layers of equal length,

each of a substantial radial thickness-and each starting at apoint axially removed a substantialdistance from the starting point of its preceding layer, thereby providing an endstructure of stepped form receding from one end of the bobbin, and; said layers together providing a uniform outside. diameter throughout the length of the mass flQIIly the last step to the base of the bobbin.

4. An article of manufacture as defined in claim: I

3 in which the end of the bobbin remote from such stepped end formation is tapered and engages, each layer, following the first, throughout the,

thickness thereof.

5. An article of manufacture as dfinedin claim.-

3 in which the exposed end of each layer presents a curved surface extending from the inner to the outer edge of each such layer.

JOHN H. GARBO'I'I'... 3 

